Barchans:
a. grow by the process of deflation.
b. are the only kind of silt.
c. are the only kind of gravel dune.
d. migrate.
e. form where there are multiple sand-transporting wind directions.
D
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What is a main source of terrigenous sediments?
a. Volcanic eruptions b. Rivers c. Dust and ash d. Cosmic dust
If water is depleted from an aquifer faster than the recharge rate,
A) the water table will rise. B) surface water will stop percolating downward. C) wetlands will flood. D) sinkholes may form.
The term "mesothermal" is used to describe climates with extreme winter temperatures
a. True b. False Indicate whether the statement is true or false
Early Earth was hot because ________
A) gravitational collapse generates heat B) a combination of collisions and radioactive decay produced heat C) there was still heat from the original big bang D) the moon's formation from an giant impact produced heat E) the Sun was much larger and heated the early planet